Colorado is primarily located in the Rocky Mountain region of the United States. It is also considered part of the Western and Southwestern regions. Geographically, it is classified as one of the Mountain states and shares the Four Corners region with Arizona, New Mexico, and Utah

. According to the U.S. Census Bureau, Colorado is included in the West region and specifically in the Mountain division, which also includes Arizona, Idaho, Montana, Nevada, New Mexico, Utah, and Wyoming

. In summary:

• Region: Rocky Mountain region
• Broader regions: Western United States, sometimes Southwestern United States
• Census classification: West region, Mountain division

This classification reflects both cultural and geographic characteristics of Colorado.